If all the terms of an AP be multiplied or divided by the same quantity, the resulting terms will form an AP, but with a new common difference, which will be the multiplication/division of the old common difference.
$I: 2P,2R,2S,2T,2U$
If the same quantity be added to, or subtracted from all the terms of an AP, the resulting terms will form an AP, but with the same common difference as before.
$II: P-3,R-3,S-3,T-3,U-3$
$ans:B$